MySQL WSREP LS - SQL

MySQL WSREP (Write Set Replication) is a synchronous multi-master replication system for MySQL databases. It is designed to provide High Availability and Scalability by replicating transactions across multiple nodes in a cluster. The WSREP protocol enables transactional replication and conflict resolution in a distributed environment.

MySQL WSREP LS is a tool that allows users to check the status of the cluster by issuing a SQL command. It provides a list of all active nodes in the cluster, along with their UUID, status, and other useful information.

To use MySQL WSREP LS, log in to your MySQL server and issue the following command:

mysql> SHOW STATUS LIKE 'wsrep_cluster%'

This command will display the current status of the cluster, including the number of active nodes, the cluster UUID, and other information.

To get a list of all active nodes in the cluster, issue the following command:

mysql> SELECT * FROM information_schema.global_status WHERE variable_name LIKE 'wsrep_cluster_%';

This command will return a table that contains information about all active nodes in the cluster, including their UUID, status, and other details.

It is important to note that MySQL WSREP LS only works when the WSREP protocol is enabled on your MySQL server. If you are not using WSREP, this command will not work.

In conclusion, MySQL WSREP LS is a useful tool for checking the status of a MySQL cluster. By issuing a simple SQL command, you can get a list of all active nodes in the cluster and their current status. This information is critical for monitoring the health and performance of your database cluster.